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CN-121994603-A - Anchor rope steel strand wires stress relaxation testing arrangement

CN121994603ACN 121994603 ACN121994603 ACN 121994603ACN-121994603-A

Abstract

The invention relates to the technical field of stress testing of anchor cable steel strands, in particular to an anchor cable steel strand stress relaxation testing device which is used for solving the problem that the existing testing device is easy to cause result deviation due to frame deformation when detecting the stress of the anchor cable steel strands; the device comprises a fixing mechanism, wherein the fixing mechanism comprises a rectangular frame, a plurality of partition boards are arranged in the rectangular frame, the rectangular frame is divided into an installation cavity and a plurality of test cavities by the plurality of partition boards, a hydraulic cylinder is arranged in the installation cavity, fixing chucks are arranged on the plurality of partition boards, one end of an anchor cable steel strand is arranged on the hydraulic cylinder, the other end of the anchor cable steel strand is arranged on any fixing chuck, tension can be applied to the anchor cable steel strand when the hydraulic cylinder is shortened, a deformation detection mechanism is arranged on the rectangular frame and used for detecting deformation of the rectangular frame and the partition boards when the anchor cable steel strand is stressed and stretched, and the device can capture the deformation of the frame and perform compensation calculation to ensure the precision of the test.

Inventors

  • LI FENG
  • ZHANG CHUNBAO
  • XING BIN
  • ZHANG GONGPING
  • LI YONGLIAN
  • TIAN WEILONG
  • LI WANGKAI

Assignees

  • 河北高速公路集团有限公司张涿分公司
  • 石家庄铁道大学

Dates

Publication Date
20260508
Application Date
20260214

Claims (10)

  1. 1. The device for testing stress relaxation of the anchor cable steel strand is characterized by comprising a fixing mechanism (100), wherein the fixing mechanism (100) comprises a rectangular frame (110), a plurality of partition boards (120) are installed in the rectangular frame (110), the rectangular frame (110) is divided into an installation cavity (130) and a plurality of test cavities (140) by the partition boards (120), a hydraulic cylinder (131) is installed in the installation cavity (130), a plurality of partition boards (120) are all provided with fixing chucks (121), one end of the anchor cable steel strand is installed in the hydraulic cylinder (131), the other end of the anchor cable steel strand is installed in any fixing chuck (121), and the hydraulic cylinder (131) can apply tensile force to the anchor cable steel strand when being shortened; The deformation detection mechanism (200) is arranged on the rectangular frame (110), and the deformation detection mechanism (200) is used for detecting deformation of the rectangular frame (110) and the partition board (120) when the anchor cable steel strands are stressed and stretched.
  2. 2. The device for testing stress relaxation of anchor cable steel strands according to claim 1, wherein the deformation detection mechanism (200) comprises a first L-shaped frame (210) and a second L-shaped frame (220), vertical sections of the first L-shaped frame (210) and the second L-shaped frame (220) are respectively abutted against opposite surfaces of two partition plates (120) connected with the anchor cable steel strands, and when the rectangular frame (110) is deformed, the distance between the two partition plates (120) is shortened, so that the first L-shaped frame (210) and the second L-shaped frame (220) are close to each other.
  3. 3. The device for testing stress relaxation of anchor cable steel strands according to claim 2, wherein a piston cylinder (240) is fixedly connected to the end portion of the horizontal section of the first L-shaped frame (210), a piston rod (260) is fixedly connected to the end portion of the horizontal section of the second L-shaped frame (220), the piston rod (260) is slidably connected to the piston cylinder (240), a spring (261) is connected between the piston rod (260) and the piston cylinder (240), a liquid medium is filled in the piston cylinder (240), a measuring cylinder (250) is communicated with the piston cylinder (240), scales are arranged on the measuring cylinder (250), and the inner diameter of the measuring cylinder (250) is smaller than the inner diameter of the piston cylinder (240), so that the liquid medium enters the measuring cylinder (250) when the piston rod (260) slides into the piston cylinder (240).
  4. 4. The device for testing stress relaxation of anchor cable steel strands according to claim 3, wherein the measuring cylinder (250) is slidably connected with a piston plate (251).
  5. 5. The cable strand stress relaxation test device of claim 2, wherein the top of the vertical section of the first L-shaped frame (210) and the top of the vertical section of the second L-shaped frame (220) are fixedly connected with arc blocks (230).
  6. 6. The cable strand stress relaxation test device of claim 2, wherein the horizontal sections of the first L-shaped frame (210) and the second L-shaped frame (220) are fixedly connected with a backing plate (270).
  7. 7. The device for testing stress relaxation of anchor cable steel strands according to claim 1, further comprising a constant temperature mechanism (300), wherein the constant temperature mechanism (300) comprises a protective cover (310), the protective cover (310) covers the upper parts of the plurality of test cavities (140), a plurality of air covers (332) are arranged on the protective cover (310) and correspond to the test cavities (140), fans (331) are arranged in the plurality of air covers (332), constant temperature pipes (340) are communicated with the plurality of air covers (332), and constant temperature air can be introduced into the constant temperature pipes (340) to blow the anchor cable steel strands when the fans (331) are operated.
  8. 8. The anchor cable steel strand stress relaxation test device according to claim 7, wherein the constant temperature mechanism (300) comprises a constant temperature box (370), water is filled in the constant temperature box (370), and an electric heating wire is arranged in the constant temperature box (370); The end of the thermostat pipe (340) is communicated with the thermostat (370), the end of the thermostat pipe (340) is flush with the inner top wall of the thermostat (370), the side wall of the thermostat (370) is communicated with an L-shaped pipe (371), one end of the L-shaped pipe (371) is located below the liquid level of the thermostat (370), and the other end of the L-shaped pipe is located above the liquid level of the thermostat (370).
  9. 9. The device for testing stress relaxation of anchor cable steel strands according to claim 8, wherein a temperature guide pipe (351) is installed below the liquid level in the incubator (370), one end of the temperature guide pipe (351) is closed, the other end of the temperature guide pipe is opened, the opening end of the port of the temperature guide pipe (351) penetrates through the side wall of the incubator (370) and extends to the outside, a plurality of communicating pipes (350) are connected between the temperature guide pipe (351) and the plurality of the thermostattes (340), and three-way valves (360) are arranged at the connection positions of the plurality of the communicating pipes (350) and the plurality of the thermostattes (340), so that the thermostattes (340) can be communicated with the incubator (370) to output moist air or can be communicated with the temperature guide pipe (351) to output dry air.
  10. 10. The device for testing stress relaxation of anchor cable steel strands according to claim 9, wherein an ultrasonic atomizer is arranged in the incubator (370); The protection cover (310) is fixedly connected with a base (320), the base (320) is fixedly connected with a motor (330), and the fan (331) is installed at the output end of the motor (330).

Description

Anchor rope steel strand wires stress relaxation testing arrangement Technical Field The invention relates to the technical field of stress testing of anchor cable steel strands, in particular to a stress relaxation testing device of anchor cable steel strands. Background The steel strand is used as a core stress material in the prestress engineering, and the stress relaxation performance of the steel strand directly determines the long-term stability and safety of an engineering structure, so that the stress relaxation rate of the steel strand is accurately measured by a professional testing device before construction. The stress relaxation test needs to be carried out for a long time (usually 1000 hours) under the set tension condition, and in the process, the steel strand can be subjected to stress relaxation due to the material characteristics, and the bearing structure of the test device inevitably generates micro deformation. The existing steel strand stress relaxation testing device adopts an integral frame structure, only a steel strand test with a single length specification can be realized, the length of a prestressed anchor cable in actual engineering often reaches tens of meters or even longer, and the conventional 1-3 m testing length of the existing device is greatly different from the actual application scene of the engineering, so that the testing data are difficult to accurately reflect the stress relaxation rule of the steel strand in the actual engineering, and reliable basis cannot be provided for engineering design and construction. Meanwhile, the conventional testing device does not monitor and compensate the deformation of the frame and the key bearing parts in a targeted manner. In the long-time loading process, the frame body, the bearing partition plate and other parts of the testing device can generate micro deformation due to stress, and the deformation can directly influence the measurement result of the actual tensile length of the steel strand, so that the stress-strain data are deviated. Disclosure of Invention The invention provides an anchor cable steel strand stress relaxation testing device, which aims to solve the problem that the existing testing device is easy to cause result deviation due to frame deformation when detecting the stress of an anchor cable steel strand. In order to alleviate the technical problems, the technical scheme provided by the invention is as follows: The utility model provides an anchor rope steel strand wires stress relaxation testing arrangement, includes fixed establishment, fixed establishment includes rectangular frame, install a plurality of baffles in the rectangular frame, a plurality of the baffle will rectangular frame is cut apart into an installation cavity and a plurality of test chamber, install the pneumatic cylinder in the installation cavity, a plurality of all install fixed chuck on the baffle, the one end of anchor rope steel strand wires install in the pneumatic cylinder, the other end is installed in arbitrary fixed chuck, the pneumatic cylinder shortens and can apply the pulling force to the anchor rope steel strand wires; The deformation detection mechanism is arranged on the rectangular frame and used for detecting deformation of the rectangular frame and the partition plate when the anchor cable steel strand is stressed and stretched. Still further, deformation detection mechanism includes first L shape frame and second L shape frame, first L shape frame with the vertical section of second L shape frame respectively with connect two baffle opposite faces butt of anchor rope steel strand wires when rectangular frame deformation, two the interval of baffle shortens, thereby first L shape frame with second L shape frame is close to each other. Still further, first L shape frame horizontal segment tip fixedly connected with piston cylinder, the tip fixedly connected with piston rod of second L shape frame horizontal segment, piston rod sliding connection in the piston cylinder, just be connected with the spring between piston rod and the piston cylinder, the piston cylinder intussuseption is filled with liquid medium, the last intercommunication of piston cylinder has a measuring cylinder, be provided with the scale on the measuring cylinder, just the internal diameter of measuring cylinder is less than the internal diameter of piston cylinder, thereby the piston rod to when the piston cylinder slides, liquid medium gets into in the measuring cylinder. Further, a piston plate is slidably connected to the measuring cylinder. Further, arc blocks are fixedly connected to the tops of the vertical sections of the first L-shaped frame and the second L-shaped frame. Still further, the horizontal segment of first L shape frame and second L shape frame all fixedly connected with backing plate. Still further still include constant temperature mechanism, constant temperature mechanism includes the protection casing, the protection casi